<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <!-- logo -->
        <img src="@/assets/pb.jpg" alt="">
        <!-- 顶部标题 -->
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出登录</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 左侧边栏区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 伸缩侧边栏按钮 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单 -->
        <el-menu
          :collapse="isCollapse"
          :collapse-transition="false"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#409BFF"
          :unique-opened="true"
          :router="true"
          :default-active="activePath"
          >
          <el-submenu
          :index="item.id+''"
          v-for="item in menuList"
          :key="item.id">
            <!-- 一级菜单模板 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级子菜单 -->
            <el-menu-item
            :index="'/'+subItem.path"
            v-for="subItem in item.children" :key="subItem.id"
            @click="saveNavState('/'+subItem.path)"
            >
              <!-- 二级菜单模板 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'home',
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    // 在生命周期函数 created 阶段请求左侧菜单数据
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear()
      // 跳转登录页
      this.$router.push('/login')
    },
    async getMenuList() {
      // 发送请求获取左侧菜单数据
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      // console.log(res)
      // console.log(this.menuList)
    },
    // 点击按钮切换菜单的折叠和打开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    saveNavState(path) {
      // 点击二级菜单的时候保存被点击的二级菜单信息
      window.sessionStorage.setItem('activePath', path)
      this.activePath = path
    }
  }
}
</script>

<style lang="less" scoped>

.home-container{
  height: 100%;
}
.el-header{
  background-color: #273746 ;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  >div{
    display: flex;
    align-items: center;
    span{
      margin-left: 15px;
    }
    img{
      width: 60px;
      height: 60px;
      margin-left: 50px;
      border-radius: 50%;
    }
  }
}
.el-aside{
  background-color: #5D6D7E;
  .el-menu{
    border-right: none;
  }
}
.el-main{
  background-color: #ccc;
}
.iconfont{
  margin-right: 15px;
}
.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
